Impact of Land Cover Changes on the Soil and Water Quality of Greens Bayou Watershed
Impact of Land Cover Changes on the Soil and Water Quality of Greens Bayou Watershed
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DOI：
10.1007/s11270-020-04890-7
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
B. Sridhar;Jericho Johnson;Adeola Mosuro
中科院分区：
文献类型：
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作者：
B. Sridhar;Jericho Johnson;Adeola Mosuro
快速的土地利用/覆被变化对城市流域的生态、环境和人类健康具有重要影响。随着城市洪水事件发生频率和强度的增加以及社区的反复淹没，监测格林河口流域（GBW）的水和土壤化学特征变得重要。本研究的目的是（1）分析营养盐和重金属的浓度在水和土壤样品沿着格林河口，（2）监测历史水质数据，（3）识别和分析土地覆盖变化的分水岭使用Landsat图像。在两个季节内，从格林河口沿着的四个不同采样地点总共收集了12个水样本和12个土壤样本，并进行化学分析处理。我们的水样分析表明，As，Cd，Pb和Hg的浓度在秋季高于夏季，并超过了临界限值。土壤分析结果表明，秋季土壤中Zn和Pb含量高于夏季，超过了土壤背景值。遥感分析显示，在1984年至2018年期间，GBW的不透水面增加了约62.2%，而植被面减少了30.6%。环境化学分析加上地理空间数据，通过确定易受变化影响的地区，证明了土地覆被变化对格林河口沿着水和土壤质量的影响，可以更好地管理这些地区，以保护这一城市流域生态系统的健康。
Rapid land use and land cover changes have a significant effect on ecology, environment, and human health in urban watersheds. With increase in frequency and intensity of the urban flooding events and repeated inundation of the neighborhoods, it is important to monitor the water and soil chemical characteristics in Greens Bayou Watershed (GBW) region. The objectives of this study were to (1) analyze the nutrient and heavy metal concentrations in water and soil samples along the Greens Bayou, (2) monitor the historical water quality data, and (3) identify and analyze land cover changes in the watershed using Landsat imagery. A total of 12 water and 12 soil samples, from four different sampling locations along the Greens Bayou, were collected during two seasons and processed for chemical analysis. Our water sample analysis revealed that the As, Cd, Pb, and Hg concentrations were higher in the fall compared with the summer and exceeded the critical limit. The soil analysis indicated that the Zn and Pb concentrations were higher in the fall over summer season and exceeded the background concentrations. Remote sensing analysis revealed that the impervious surface in the GBW increased by about 62.2% while the vegetative surface decreased by 30.6% during the period of 1984 to 2018. Environmental chemical analysis coupled with geospatial data demonstrated the impact of land cover changes on water and soil quality along the Greens Bayou by identifying areas vulnerable to change, which can be better managed to preserve the health of this urban watershed ecosystem.